21155363071 has 8 divisors (see below), whose sum is σ = 21235021344. Its totient is φ = 21075816960.

The previous prime is 21155362981. The next prime is 21155363083. The reversal of 21155363071 is 17036355112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21155363071 - 2²⁹ = 20618492159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21155360071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359926 + ... + 414556.

It is an arithmetic number, because the mean of its divisors is an integer number (2654377668).

Almost surely, 2^21155363071 is an apocalyptic number.

21155363071 is a deficient number, since it is larger than the sum of its proper divisors (79658273).

21155363071 is a wasteful number, since it uses less digits than its factorization.

21155363071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56081.

The product of its (nonzero) digits is 18900, while the sum is 34.

The spelling of 21155363071 in words is "twenty-one billion, one hundred fifty-five million, three hundred sixty-three thousand, seventy-one".